Lock mechanism



May 14, 1935. A. G. LYONS ET AL LOCK MECHANISM Filed Sept. 22. 1952 INVENTORS. William 5. [H 2111 Patented May 14, 1935 LOCK MECHANISM 7 Arthur G. Lyons, Pennside, and William S. Diehl.

Shillington,

Pa, assignors, by mesne assignments, to The Dent Hardware Company, Fullerton, Pa, a corporation. of Pennsylvania Application September 22, 1932, Serial No. 034,388

3 Claims.

This invention relates to improvements in look mechanisms.

The primary object of this invention is the provision of improved key operated pin tumbler lock means for selectively locking the operating handle of a conventional closure type of latch fastener.

A further object of this invention is the provision of an improved pin tumbler lock mechanism which includes an unusually compact and strong construction for securing a locking bolt to the rotary plug of the lock mechanism with a lost motion connection, admitting of only a partial rotation of the lock bolt for a complete rotation of the plug.

A further object of this invention is the provision of improved key operated cylinder locks, for selectively looking a pivoted lever, or like pivoted member in an inoperative position.

Other objects and advantages of this invention will be apparent during the course of the following detailed description.

In the accompanying drawing, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views,

Figure 1 is a front view of a latch type of closure fastener, such as is set forth in U. S. Patent #1,703,249, showing the improved pin tumbler lock mechanism associated therewith.

Figure 2 is a fragmentary cross sectional view taken substantially on the line 2-2 of Figure 1, showing the lock bolt of the pin tumbler lock mechanism in looking position, to prevent operation of the handle that controls the latch bolt.

Figure 3 is a view similar to Figure 2, but with the locking bolt of the pin tumbler lock mechanism in unlocked position, and the handle in position to release the latch bolt.

Figures 4 and 5 are perspective views respectively of the plug of the pin tumbler lock mechanism and the lock bolt associated therewith.

Figure 6 is a view showing the assemblage of the lock bolt of Figure 5 upon the plug of Figure 4.

In the drawing, wherein for the purpose of illustration is shown only a preferred embodiment of the invention, the letter A may generally designate a latch type of closure fastener, such as is set forth in U. S. Patent #l,'703,249, which in addition to a keeper (not shown) includes a casing B, latch bolt C, pivoted latch bolt operating lever D, and other means set forth in the above mentioned patent which is not necessary to detail herein. An improved key actuated pin tumbler lock mechanism E is associated directly with the closure fastener A, and includes a casing F, rotary plug G, locking bolt H having a lost motion connection with the plug G, and a key K for actuating the pin tumbler mechanism;

The latch type of closure fastener shown in the drawing is most frequently used upon refrigerators and cooler cabinets, as is a matter of common knowledge. The latch bolt is caused to seek its operative position by engagement with its keeper when the door is closed. The casing 13 is of course attached to the door or closure, and the latch bolt C is spring actuated and oscillatively mounted in the casing B. The operating lever D has a head portion l0 pivoted at I I upon the casing B; the said operating lever Ill having latch bolt engaging fingers H which control either the lifting or lowering of the latch bolt, in a manner well understood in the art. It is a matter of common knowledge to those skilled in the art to which this invention relates that no satisfactory type of key controlled lockmechanism has been provided to prevent unauthorized actuation of the pivoted type of handle D. Ordinary key controlled locking bits have been provided to prevent latch bolt actuation, but so far as we are aware no practical and satisfactory type of pin tumbler key actuated lock has heretofore been developed to serve the purpose.

In the present invention the casing F includes the barrelportion provided with a cylindrical bore 2| therethrough for rotatably receiving the plug G. The casing 20 furthermore includes the pin tumbler receiving extension 24 having parallel guide ways 25 therein for receiving the usual tumbler pins 26, and springs therefor; the same being retained in position by the usual slide plate 28. The rotary plug G includes a body portion which at one end has a retaining flange 3| for seating in the outer enlarged end of the cylindrical bore M. The inner end of the plug body 30 is annularly reduced at 32 and provided with a single lock bolt turning extension 33 which projects beyond the reducing edge 34 of the body 30. The plug body 30 is of course provided with the usual pin tumbler sockets, as shown in Figure 2, and a keyway 36 opening at the outer end of the plug, for receiving'the usual kerfed key K. The extreme end of the plug extension 32 is provided with an axially tapped opening 31 for receiving a screw 38, as shown in Figure 2, by means of which the lock bolt portion H is rotatably secured upon the end of the plug G.

The bolt H includes a sleeve portion 40 having at one end an internal annular flange 4| provided with an opening 42 thru which a bearing portion of the screw 5| is slipped in order to permit of the attachmeent of the screw 38 to the plug G, in the manner shown in Figure 2 of the drawing. Inasmuch as the locking bolt H rotatably bears on the screw 38, relative rotation of the locking bolt with respect to the plug G is permitted, although no axial movement of the locking bolt away from the plug is permitted. At its opposite end the sleeve portion 40 has a segmental extension 45 around 180 of the sleeve 40; the end edges 41 of this segment 45 being intended to abut with the plug extension 35 in limiting the lost motion connection of the lock bolt H upon the plug G to 180, as is quite apparent. In the assemblage, the sleeve 40 is slipped upon the reduced end 52 of the plug and the outer circumferential surfaceof the sleeve 40 then lies flush with the plug G, as is shown in Figure 2 of the drawing. An annular flange 50 at the inner end of the sleeve 40 prevents retraction of the plug and lock bolt through the bore 2 I, as is quite apparent. Another improved feature of the lock bolt construction is the eccentric bolt body 55 which has a locking edge parallel with and spaced a predetermined distance from the axis of rotation of the plug G; the cam body from its outer end 51 being beveled at 60, although this bevel 60 is not essential, as some other throw contour may be provided in lieu thereof; the essential feature being the eccentric offset of the bolt 55; particularly at .its outer end to one side of the axis of rotation of the plug extended.

The casing F is assembled upon the lever D within a suitable pocket 60" provided therein; the pocket being open upon the rear edge of the lever D so that the entire key operated pin tumbler mechanism may be assembled from said rear edge; the said pocket 60 being circularly opened upon the front of the lever D so as to only expose the front surface of the rotary plug G and the annularly surrounding portion of the casing E, as is shown in Figure 1 of the drawing. The casing F is secured in place against removal by means of a transverse pin- 62 shown in Figure 2 of the drawing.

The casing 13 of the latch type of closure fastener A has a socket opening 63 to serve as a keeper for the lock bolt H, as shown in Figure 2 of the drawing.

As to the operation of the pin tumbler lock mechanism, as shown in Figure 2, the lever D in the position shown permits the latching bolt C to assume the position shown in Figure 1, which is of course the latching position as will be found by referring to the patent above mentioned. In this position, with the lock bolt 51 in the lowermost position in the socket 63, the straight edge along the lower surface thereof, which is really the throw or cam of the bolt H, is in position to engage the socket of the keeper B and prevent the lever handle D from being pivoted in order to withdraw the latching bolt from its keeper (not shown). In this position the key K may be withdrawn, as is quite obvious. If it is desired to unlock the pin tumbler lock mechanism and permit movement of the pivoted lever D to unlatch the bolt 0 it is merely necessary to turn the key to the right, after inserting it into the lock E in the position shown in Figure 2. During the first 180 of rotation of the key K the plug G only will be turned, and the extension 33 of the plug will swing between the shoulders I! opposite the segmental extension l until at the end of this movement the extension 33 will engage one of the shoulders 41, and during the next 180 of movement of the key K the bolt H will turn through 180 to position the same as shown in Figure 3. The key-K will then be in position'to permit withdrawal, as the pin tumblers clearly show in Figure 3 of the drawing. Since the throw of the locking bolt H is eccentric upon the plug G, in the position shown in Figure 3, the handle D may of course be pivotally moved to latch or unlatch the bolt C.

Various changes in the shape, size, and arrangement of parts may be made to the form of invention herein shown and described, without departing from the spirit of the invention or the der lock the combination of a casing, a rotatable plug in the casing, a set of pin tumblers for the casing and plug permitting withdrawal and insertion of a key when the plug is in a predetermined position with respect to the casing, and a locking bolt mounted for partial rotation upon the plug at an end thereof and extending endwise therefrom, said locking bolt having a locking extension of segmental formation eccentric to the axis of rotation of the plug and divergently beveled from its free end in the direction of the plug with respect to the opposed side of said extension.

2. In a closure fastener the combination of a supporting casing, a latch bolt movably mounted upon the supporting casing, a pivoted handle for actuating the latch bolt, a rotatable plug upon the handle, key actuated means for locking the plug against rotation upon the handle, said casing having a keeper opening therein, a bolt mounted upon the plug and extending into said keeper opening of the casing having a side formed to bind against an edge of the keeper opening when the handle is in one position, to prevent pivotal movement thereof, said bolt being shaped to clear said edge of the keeper opening when the bolt is in another position to permit pivotal movement of said handle.

3. In a closure fastener the combination of a supporting casing, a latch bolt movably mounted upon the supporting casing, a pivoted handle for actuation of the latch bolt, a rotatable key actuated plug upon the handle below the pivot axis thereof and in a line transverse to the pivot axis of the handle, said casing having a keeper opening therein and the said-rotatable plug having a lock bolt endwise extending therefrom and from the handle and extending into said keeper opening of the casing, said bolt at one side of the axis of rotation of the plug upon which it is mounted having a surface adapted to engage the edge of the keeper opening remote from the pivot axis of said handle to lock the said pivoted handle against pivotal movement, and the bolt at the opposite side of its axis of rotation being free of any locking portion so as to permit pivotal movement of the handle when the endwise extending locking bolt lies in a position between its axis of rotation and the pivot axis of the handle.

ARTHUR G. LYONS. WILLIAM 'S. DIEHL. 

